THARANITHARAN, V., and K. SRINIVASAN. 2010. “Removal of Ni(II) from Aqueous Solution by Using Surfactant- EDTA Modified Amberlite XAD-7HP and Duolite XAD-761 Resins”. Asian Journal of Chemistry 21 (9):7163-72. https://asianpubs.org/index.php/ajchem/article/view/12219.